I just got my bike since the 12th sept. and i've also noticed some light rust on the discs.
I also keep him outside, but out of the wind and rain.

Hope it's not getting any worse.

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Derbi Senda DRD Sm "04 (black) => BMW F650GS "04 (yellow) => Yamaha xt660z T�n�r� "09 (blue)